645117562 has 8 divisors (see below), whose sum is σ = 990180576. Its totient is φ = 315057372.

The previous prime is 645117541. The next prime is 645117587. The reversal of 645117562 is 265711546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750598 + ... + 3750769.

It is an arithmetic number, because the mean of its divisors is an integer number (123772572).

Almost surely, 2^645117562 is an apocalyptic number.

645117562 is a deficient number, since it is larger than the sum of its proper divisors (345063014).

645117562 is a wasteful number, since it uses less digits than its factorization.

645117562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7501412.

The product of its digits is 50400, while the sum is 37.

The square root of 645117562 is about 25399.1645925609. The cubic root of 645117562 is about 864.0647501271.

The spelling of 645117562 in words is "six hundred forty-five million, one hundred seventeen thousand, five hundred sixty-two".